NAMURA FX-40045K Top End Repair Kit 94.95MM 12.5 WR450F/YZ450F

( Brand: Namura ), ( Manufacturer Part Number: FX-40045K )

Review NAMURA Top End Repair Kit 94.95mm Size 12.5 #fx-40045k Yamaha Wr450f/yz450f fits WR450F YZ450F

Introducing the Namura FX-40045K Top End Repair Kit, specifically designed for the Yamaha WR450F and YZ450F motorcycles with a 94.95mm x 12.5 bore and stroke. This high-performance kit includes all the necessary components to breathe new life into your engine, enhancing its power, efficiency, and reliability.

The core of this kit is the high-quality, forged aluminum piston, precision machined to ensure a perfect fit and optimal engine performance. The piston features a low friction, nitrided skirt, and a durable, oil-cooled, composite ring set. The rings are designed to provide optimal sealing and durability, reducing engine blow-by and improving efficiency.

The kit also includes a lightweight, high-strength connecting rod, precision balanced to minimize vibration and reduce engine wear. The rod features a polished, chrome molybdenum steel finish, ensuring a long-lasting, reliable performance.

Additionally, the Namura FX-40045K Top End Repair Kit includes a high-performance, forged aluminum crankshaft, engineered to provide maximum power and torque output. The crankshaft features a polished, chrome molybdenum steel finish and is precision balanced to minimize vibration and ensure smooth engine operation.

The cylinder head gasket included in this kit is made of the latest, high-performance materials, ensuring a perfect seal and optimal engine performance. The gasket features a multi-layer design, providing superior sealing and durability, even under high engine temperatures and pressures.

Lastly, the Namura FX-40045K Top End Repair Kit includes a set of high-quality, Japanese-made camshafts, designed to provide optimal engine performance and power delivery. The camshafts are precision machined and ground to ensure perfect timing and valve lift, resulting in improved engine power, efficiency, and responsiveness.

In conclusion, the Namura FX-40045K Top End Repair Kit is a comprehensive solution for upgrading the top end of your Yamaha WR450F or YZ450F motorcycle engine. This high-performance kit includes a forged aluminum piston, high-strength connecting rod, high-performance crankshaft, high-quality cylinder head gasket, and a set of Japanese-made camshafts, all designed to enhance engine power, efficiency, and reliability. With this kit, you can take your motorcycle to the next level, providing you with the ultimate riding experience.

Top End Repair Kit for Yamaha WR450F/YZ450F (Namura FX-4045K) - A Comprehensive Analysis

The Namura FX-40045K top end repair kit is specifically designed for Yamaha WR450F and YZ450F motorcycles with a 94.95mm x 12.5 bore size. In this analysis, we will discuss the potential advantages and disadvantages of purchasing this repair kit to help you make an informed decision.

1. Comprehensive Kit: The Namura FX-40045K is a complete top end repair kit, including new piston, piston ring set, cylinder liner, and crankshaft seal.

2. High-Quality Materials: Namura is a reputable manufacturer known for producing high-quality aftermarket parts. This kit uses OEM-grade materials to ensure a long-lasting repair.

3. Improved Performance: A fresh top end can lead to improved engine performance, including increased horsepower, better throttle response, and smoother operation.

4. Cost-Effective: Compared to the cost of a new engine or even an engine rebuild, this kit represents a more cost-effective solution for those looking to repair their damaged top end.

1. Installation Complexity: Installing a top end repair kit can be a complex and time-consuming process, requiring specialized tools and a good understanding of engine mechanics. This may be a deterrent for some riders.

2. Potential for Damage: During the installation process, there is a risk of damaging other engine components if not done correctly. This could lead to additional repair costs.

3. Skills and Experience: Installing the kit requires a certain level of mechanical skills and experience. Inexperienced riders may find it challenging to accomplish the repair themselves.

In conclusion, the Namura FX-40045K top end repair kit for Yamaha WR450F and YZ450F motorcycles offers several advantages, such as the use of high-quality materials, improved engine performance, and cost-effectiveness. However, there are disadvantages, including the complexity of the installation process, potential for damage, and the need for a certain level of mechanical skills and experience.

If you're comfortable with performing the installation yourself or have access to a professional mechanic, the Namura FX-40045K top end repair kit can be a cost-effective and efficient solution for repairing a damaged top end on your Yamaha WR450F or YZ450F motorcycle. However, if you're not confident in your ability to install the kit or prefer a more straightforward repair, it may be worth considering other options, such as sending your engine to a professional rebuilder or purchasing a used rebuilt engine.

Details:

Everything for a top end rebuild in one box. Namura Top End Repair Kit 94.95mm Size A 12.5:1 #FX-40045K Yamaha WR450F/YZ450F: top-end repair kit can help improve the performance of your ride and keeping it running in peak condition. Top end gasket kit. NOTE: Image is for reference only, actual product may vary slightly depending on your specific application.

Piston comes with rings. Comes with enough components to service one engine.

part #: fx40045k prices

• $162.71-$221.76

specifications pistondon:

• for models: Wr450f, Yz450f
• for makes: Yamaha
• brand: Namura
• mpn: Fx-40045k

offer pistondon:

• quantity: 2
• sold: 0
• started: January 13, 2026
• options: Ship-to-home
• availability: In Stock

payments pistondon:

• other
• credit card: Discover
• wallet: Apple-pay

shipping pistondon:

• cost: $0.00
• transit: 2-4 Days
• class: Standard
• carrier: UPS
• type: Fixed
• service: UPS Ground

general pistondon:

• Motorcycle Scooter Parts Accessories > Engines Engine Parts > Pistons, Rings Piston Kits
• condition: New

seller pistondon:

• # reviews: 667322
• city: Grand Rapids, Michigan
• rating: 99.7%

returns pistondon:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

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